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Investment in OC-BVI - Income statement details (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Investment in OC-BVI |  |
Revenue | $ 3,146,550 | $ 2,845,211
Cost of revenue | 2,156,460 | 1,348,046
Gross profit | 990,090 | 1,497,165
General and administrative expenses | 781,677 | 707,034
Gain on long-lived asset disposition | 1,000 | 0
Income from operations | 209,413 | 790,131
Other income (expense), net | (32,341) | 3,393,271
Net income | 177,072 | 4,183,402
Income attributable to non-controlling interests | 74,233 | 52,275
Net income attributable to controlling interests | $ 102,839 | $ 4,131,127

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